Iron-based Amorphous Nanocrystalline Magnetic Core Of Electric Reactor

Iron-core reactor can filter out harmonic and play a role as reactive power compensation as a part of power grid, mechanical, chemical, electric powder transmission and so on. When it works, the problems can happen, such as temperature rising, noise, magnetic flux leakage, and these problems can seriously influence its normal work. So researching the reactor core is significant.Based on the main problems of high power reactor core, the encapsulation materials ratio of iron-based amorphous nanocrystalline core is firstly optimized, then main factors of inductance and loss characteristics of magnetic cores is systematically studied. And according to the research results, the reactor core is successfully designed and preparation.Research results show that compared with silicone rubber and polyurethane resin, epoxy resin is more suitable for the insulation materials of a reactor core, and when epoxy resin/acetone is1/50, the core is cured and insulated best.The air-gap is the key factor of initial magnetic permeability and Hj values of magnetic cores. When the ratio of air gap is less than3%, the initial magnetic permeability of FeSiB magnetic cores and FeCuNbSiB magnetic cores drops sharply with the ratio of air gap increasing, while Hj value raises. When the ratio of air gap is more than3%, the varied range of the initial magnetic permeability and Hj value is decrease along with the air gap increasing. When the ratio of air gap is1%,3%and5%, and the size of magnetic core is30-20.5-15mm, the initial permeability and Hj value of FeSiB magnetic cores respectively are155and6500A/m,87and8500A/m,65and10500A/m, and the initial permeability and Hj value of FeCuNbSiB magnetic cores are182and4000A/m,100and6400A/m,80and8100A/m. In addition, heat treatment process and structure of magnetic core has a certain influence on the initial permeability and Hj under the condition of the same air gap.Besides, the heat treatment process has massive influence on the loss of iron-based amorphous and nanocrystalline. Without air gap, the FeCuNbSiB magnetic cores loss is reduced with the increase of heat treatment temperature, and when f is20 kHz, and the value of magnetic filed intensity is0.2T, the loss of quenching cores and the loss of magnetic cores heat treatment at temperature400℃, the loss of magnetic cores heat treatment at temperature550℃are respectively130W/kg,14.33W/kg and3.53W/kg. When the air gap ratio is5%, with the increase of heat treatment temperature, loss of FeCuNbSiB magnetic core increases. when the frequency is20kHz, and the value of magnetic filed intensity is0.1T, the loss of quenching cores and the loss of magnetic cores heat treatment at temperature350℃, the loss of magnetic cores heat treatment at temperature450℃and the loss of magnetic cores heat treatment at temperature550℃are respectively8.059W/kg,20.41W/kg and42.71W/kg,56.04W/kg.In this paper, the size of reactor cores prepared is (p160×φ90×90mm and the size of air gap is20mm. When tested under1.35times by the rated current, the temperature rise of the reactor cores are blow42℃, and conform to the requirements of the reactor cores.